French Press Ratio Calculator
Coffee grams for a water amount at your ratio
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French Press Ratio Calculator turns the numbers behind coffee grams for a water amount at your ratio into a result, step by step. Type Water (grams/ml) and Ratio (water : coffee) into French Press Ratio; each keystroke re-runs the math. French Press Ratio prints the result and its working. French Press Ratio suits budgeting and planning checks. French Press Ratio runs in your browser. Lifestyle data stays in the tab. French Press Ratio is part of the Lifestyle collection on CalcProMaster, alongside french press ratio calculator coffee grams water brew, free calculators and more. Run French Press Ratio twice to find the driving input. French Press Ratio stays bookmarked for next time.
What the defaults give
500 g of water at a 1:15 ratio needs 33.3 g of coffee.
Grind coarse — sea-salt texture — steep four minutes, break the crust, then plunge slowly.
The arithmetic
Coffee = water ÷ ratio
The ratio is water to coffee by weight, so 1:15 means fifteen parts water to one part coffee. Working in grams makes it trivial: 500 ÷ 15 = 33.3 g. Measuring water by volume and coffee by weight, or the reverse, is where most brews go wrong by 20%.
Worked examples
500 g at 1:15 → 33.3 g
250 g at 1:15 → 16.7 g
1,000 g at 1:15 → 66.7 g
500 g at 1:30 → 16.7 g
500 g at 1:12 → 41.7 g
500 g at 1:17 → 29.4 g
A French press holds roughly 350 ml of brewed coffee for a 500 g dose, because the grounds retain about 2 g of water each. That is why a "four cup" press rarely fills four mugs.
Which ratio to use
1:15 sits in the middle of the usual 1:12–1:17 range. Lower ratios — 1:12 — produce a heavier, more textured cup that suits dark roasts and milk. Higher ratios — 1:17 — let a light roast show its acidity. The immersion method is forgiving: because extraction is even and stops when you press, small ratio changes matter less than they do in espresso.
Adjust the grind before the ratio. A press full of fines from a blade grinder tastes muddy no matter what the numbers say; a coarse, consistent grind is the single biggest improvement available.
The method, briefly
Add the coffee, pour all the water at once, and start a four-minute timer. At the end, a crust of grounds floats on top; stir it, skim the foam if you like, then press slowly. Pressing fast forces fines through the mesh and adds grit. Decant immediately — coffee left standing on the grounds keeps extracting and turns bitter within a couple of minutes.
Water temperature is the input this tool does not ask for. 92–96 °C is the working range; boiling water straight from the kettle scalds a light roast and flattens it.
The tool declines ratios below 1:10 as a likely data-entry problem, so a very strong 1:8 brew has to be calculated by hand: 500 ÷ 8 = 62.5 g.
Frequently Asked Questions
How much coffee for 500 ml of water?
33.3 g at 1:15. For a stronger cup use 1:12, which needs 41.7 g.
What ratio should I start with?
1:15 is a good middle. Move toward 1:12 for a heavier cup and 1:17 for a lighter, brighter one.
How coarse should the grind be?
Coarse, like sea salt. Fines pass through the mesh and make the cup muddy.
How long should it steep?
Four minutes, then break the crust and press slowly. Leaving it longer extracts bitterness.
Why does a four-cup press not fill four mugs?
Grounds retain water — roughly 2 g per gram of coffee — so a 500 g brew yields about 430 g of liquid once the bed is left behind.
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